Wow, that's a long time. I've been with my wife for that long and I couldn't fathom her not being around. Maybe talking about the loss you BOTH feel will help things. It may help you both sort out your own individual feelings.
I've really never seen where communication is a bad thing. Worst case scenario, he tells you he's not comfortable talking to you about it. At that point, maybe there's a friend whom you could confide in? Or, use the resources available to you here. We may not know you, but I'm sure we can sympathize with what you're going through.
Live life to the fullest 'cause you never know if you're gonna wake up tomorrow!